a residual value guarantee, fixed-price purchase option, or similar
 feature.
In 2016, United signed a
 seven year lease extension through 2024 with the Metropolitan
 Washington Airports Authority to continue its use of terminals at
 Washington Dulles International Airport.
United’s nonaircraft
 rent expense was approximately $1.2 billion, $1.3 billion
 and $1.4 billion for the years ended December 31, 2016,
 2015 and 2014, respectively.
In addition to nonaircraft
 rent and aircraft rent, which is separately presented in the
 consolidated statements of operations, United had aircraft rent
 related to regional aircraft operating leases, which is included as
 part of Regional capacity purchase expense in United’s
 consolidated statement of operations, of $439 million,
 $461 million and $442 million for the years ended
 December 31, 2016, 2015 and 2014, respectively.